android常用UI使用案例：SeekBar

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="SeekBar" />

    <SeekBar
        android:id="@+id/seekbar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="50"
        android:thumb="@drawable/seeker" />

    <TextView
        android:id="@+id/text"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

 

package com.test.androidui;

import android.app.Activity;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.widget.SeekBar;
import android.widget.TextView;

public class MainActivity extends Activity {
    private SeekBar seekbar = null;
    private TextView text = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        seekbar = (SeekBar) super.findViewById(R.id.seekbar);
        text = (TextView) super.findViewById(R.id.text);
        // 设置文本可以滚动
        text.setMovementMethod(ScrollingMovementMethod.getInstance());
        seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListenerImp());
    }

    private class OnSeekBarChangeListenerImp implements SeekBar.OnSeekBarChangeListener {

        // 触发操作，拖动
        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            text.append("正在拖动,当前值:" + seekBar.getProgress() + "\n");
        }

        // 表示进度条刚开始拖动，开始拖动时候触发的操作
        public void onStartTrackingTouch(SeekBar seekBar) {
            text.append("开始拖动,当前值:" + seekBar.getProgress() + "\n");
        }

        // 停止拖动时候
        public void onStopTrackingTouch(SeekBar seekBar) {
            text.append("停止拖动,当前值:" + seekBar.getProgress() + "\n");
        }
    }
}